Principle of orbit hard-seal ball valve
Rail hard sealing ball valves, the working principle of the principle of CAM in rotation and ball valve seal, rotating mated again from the valve seat sealing ball to. When the valve is in full open position, turn the handwheel, instantaneous needle in stem nut and thrust bearing, stem fell and driving ball to begin to spin. Connection rotation handwheel, stem precision spiral curve trough orbit, and embedded in the guide pin interaction, driving ball with constantly stem clockwise rotation. When the valve will be closed, stem drive with seat sealing ball under the condition of complete without friction spinning the 90 °. Continue to turn the handwheel, fall again stem through the bottom of the valve stem CAM structure, mechanical and oppression sphere seal seat sealing ball close contact with, so as to achieve the goal. Sealing Rail hard sealing ball valves are seated position when the handwheel, rotate counterclockwise in stem nut and thrust bearings with stem begins to rise, and drive to begin to spin, sphere. Continuous rotation handwheel, stem will rise in the sphere of influence to tend to the seat. Rail hard sealing ball valves will be open on the stem, the precise spiral curve trough orbit and embedded in the guide pin interaction among the sphere and driven completely without friction under the condition of ceaselessly according to counterclockwise rotation. Continue to turn the handwheel, when the stem to limit position when the ball has also, with stem reverse 90 °, the valve is in full open position already. Rail hard sealing ball valves structure features: the traditional ball float type, whether fixed or sphere and seat always contact, switch torque, sealing, track the ball to hoist, ball on delta Angle deflection - first, then turn, switch and seat from the whole sphere, seat is not scratch and open torque.
